Fixes #11981

[mohit3011]

<If this pull request fixes an issue please indicate which issue by typing "Fixes #NNNN" below.>

[jksuom]

There is another pending PR #12008 on this issue. That will probably settle the issue.

BTW, for your next PR it is recommended to create a new branch with a name different from 'master' since that may lead to confusion.

[mohit3011]

Sorry I read your comment after the tests had been initiated . I am getting the same error as #12008 got , If there is no problem then can you look into what is wrong in my PR.

[jksuom]

"File contains trailing whitespace: /home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/sympy-1.0.1.dev0-py2.7.egg/sympy/simplify/tests/test_powsimp.py, line 297"

This is from the Travis CI log https://travis-ci.org/sympy/sympy/jobs/188216580,

You can catch such errors before pushing to GitHub by running bin/test quality.

[mohit3011]

Thank you very much for guiding me.